when they encounter an obstacle in the track, the cars might then move to avoid the obstacle causing the cars behind them to slow down or try to move to avoid the cars in front of them and the obstacle.

이 문장 너무 길어서 해석이 도통 안되네요 .... ㅜㅠ 자세하고 친절한 답변 부탁드리겠습니다.